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过去一年提交了

勋章 ①金银铜：在竞赛中获得第一二三名；②好习惯：自然月10天提交；③里程碑：解决1/2/5/10/20/50/100/200题；④每周打卡挑战：完成每周5题，每年1月1日清零。

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提交记录

提交日期 题目名称 提交代码
2026-02-06 与X轴有且只有一个交点的一元二次函数  
select * from numbers_for_fun where a != 0 and b * b -4* a *c=0
order by id asc;
2026-02-06 与X轴有且只有一个交点的一元二次函数  
select * from numbers_for_fun where a != 0 and b * b -2* a *c=0
order by id ;
2026-02-06 与X轴有且只有一个交点的一元二次函数  
select * from numbers_for_fun where a != 0 and c = 0
order by id ;
2026-02-06 开口向上且经过原点的一元二次函数  
select * from numbers_for_fun where a >0 and c = 0
order by id;
2026-02-06 必过(3, -8)的一元一次函数  
select * from numbers_for_fun where a =0 and 
3 * b + c + 8 = 0
order by id asc ;
2026-02-06 必过(3, -8)的一元一次函数  
select * from numbers_for_fun where a =0 and b < 0 and c >= 0 and 
3 * b + c + 8 = 0
order by id ;
2026-02-06 必过(3, -8)的一元一次函数  
select * from numbers_for_fun where a =0 and b < 0 and c >= 0 and 
3 * b + c + 8 = 0;
2026-02-06 不经过第三象限的一元一次函数  
select * from numbers_for_fun where a = 0 and b <0 and c >=0;
2026-02-06 特定渠道的中档单价用户  
select * from apple_pchs_rcd where order_channel = '官网' and payment_method= 'Apple Pay' and product_price > 3000
order by order_id ;
2026-02-06 文科潜力股  
select * from scores where exam_date = '2024-06-30' and subject in('历史','政治','地理') and score >=90
order by score,student_id,subject desc;
2026-02-06 给英语成绩中上水平的学生拔尖  
select * from scores where exam_date = '2024-06-30' and subject = '英语' and score between 100 and 110 order by score desc;
2026-02-06 给英语成绩中上水平的学生拔尖  
select * from scores where exam_date = '2024-06-30' and score between 100 and 110 order by score desc;
2026-02-06 给英语成绩中上水平的学生拔尖  
select * from scores where exam_date = '2024-06-30' and score is not null
and score between 100 and 110 order by score desc;
2026-02-06 给英语成绩中上水平的学生拔尖  
select * from scores where exam_date = '2024-06-30' and score is not null
and score between 100 and 110;
2026-02-06 找出三个班级的女生  
select * from students where gender = 'f' and class_code in ('C219','C220','C221')
order by student_id;
2026-02-06 找出三个班级的女生  
select * from students where gender = 'm' and class_code in ('C219','C220','C221')
order by student_id;
2026-02-06 大于J小于K的手牌  
select 
    * 
from 
    hand_permutations
where 
    card1 > 'J'  and card1 < 'K'
    and 
     card2 > 'J'  and card2 < 'K'
2026-02-06 大于J小于K的手牌  
select * from hand_permutations where left(card1,1)='Q'
and left(card2,1)='Q';
2026-02-06 2000年以前出生的男歌手  
select * from singer_info
where gender = 'm' and left(birth_date,4)<2000;
2026-02-06 总分超过300分的学生  
select student_id from subject_score 
where chinese + math + english >=300;